Systems
Read system as any social, economical, mechanical, electrical, biological, or software system. I recommend the following book for a deeper appreciation of systems in general.
See:
General System Theory
by Ludwig von Bertalanffy...

In the diversity of tools for tasks in group and cooperative work, the concept of wiki Web is gaining momentum, as said the following article:
'Wiki' May Alter How Employees Work Together
http://online.wsj.com/article_email/0,,SB109105974578777189...